Solution

prove

Solution

Solution steps
Manipulating left side
Rewrite as
Rewrite using trig identities
Use the Angle Difference identity:
Simplify
Add similar elements:
Use the negative angle identity:
We showed that the two sides could take the same form

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Frequently Asked Questions (FAQ)

  • Is sin(x)sin(2x)+cos(x)cos(2x)=cos(x) ?

    The answer to whether sin(x)sin(2x)+cos(x)cos(2x)=cos(x) is True